Attrition mill



June i Wv LOKEN 'ATTMTION MILL Filed Oct. so. 1926 2 Sheets-Sheet 1 w. LoKEN ATTRITION MILL June 7 192,7'.A

Filed oct. so. 192e 2 sheets-sheet 2 MQW Patented June 7, 1927.

Ts-D. sT ATES WEBSTER roianlv,y or WINnoM, MINNESOTA.

arrnrrroiv d MILL.

Application ineaV october'so, 192e; serial No. 145,203;

My invention relates to attritionlnills and i more particularly to.afeeder for producing a constant uniform How of stock to th grinding plates of a mill.l

` an uneven stock to the grinding-plates whichv i' with reversible motors for independent-lyV Feedingv devices heretoforev used havev not been entirely satisfactoryl for the .reason that they7 choke up and clogA and thereby produce causes an overload on the motors that., drive said plates, part of the ltime and an underload the balan'cefof, the time, thus making it expensive to operatean attrition mill. v

Itis customary7l to provide attrition mills `the grinding 'plates' so .that l there is a constantuniforrn load onthe motors. The invention further provides `means for operat ingthe feeder from one of the motors ofthe mill in 'a given direction, irrespectivey of the direction of rotation of the grinding plate operated by the respective'rnoto'r.

To the above end, generally stated, the invention consists of the novel devices and combinations of devices hereinafter ,described and defined in the claims.

' In the accompanying drawings, which illustrate the invention, like characters in- 1 dicate like parts throughout-the several views. I

1 Referring tothe drawings@ .F.ig. lis a side elevation of an attrition mill having Vthe invention embodied therein,

with somefparts broken awa-y and other' parts'shovvnVv in central vertical section;

Fig. 2- is a plan view of the same with some parts sectioned on the line 2 2 of Fig.

1; and l p' L i Fig. 3 isi a detailvievv in section taken kon the/line 3*-3 of Fig. 2, on an enlarged scale.`

The attrition millillustratedA includes a bed Llon Which is mounted a pair ofelectrlc motors 5, of the reversible type, the arma AVture shafts 6 of-Which are axiallyvspaced and axially aligned. Said armature shafts 6 are mounted in bearings 7 on, the bed 4. On thel inner ends of the armature shaftsf6 is arpa-ir of co-operatinggrinding plates 8 mounted in a case9 on the bed 4. n Mounted Which engages the shipper collar 17.y As previously stated, the motors 5 areop-I erated to reversely rotate.. the 'grindinm onthecaseQ is an upstanding feed spout l0 arranged t-o discharge yinto the'eye of one of the grinding plates 8 and has on its upper end a hopper 11 for holding stock .to be delivered tothe grinding plates 8. IThe parts thus fardescribed are of standard and Well .known construction. f

v.ce i

Referring now in detail to the invention,

the numerals 12 'and 13 indicate fa .pair of co-operating feed rollsjjournaled in the bottom of the hopper 11tlieformerxof which has a smooth peripheryand the latter of which has a corrugated periphery. A pair of hopper plates Mare secured in the hopper 11 above the rolls 12 and18 for supporting part of the stockin said hopper and direct ing the same between said rolls.. Keyedto the shaft of the roll 13, outward ofthe hopff per 11, is a face' frictionwheel 15 With which co-o'perates a peripheral friction `Wheel. 16. having on its huba shipper collar. 17. Said lperipheral'friction Wheel 16 `is. keyed toa long counter-shaft 18 journaledjin bearings A19 on the bedel. iThe counter-shaft 18, eX;-

tends .parallelto' the lface friction wheel 15; and supports theperipheral friction Wheel 16.fondiametricaladjustinentson said ,face

friction* Wheel. The ycountershaft v 18 is .drivenfrom one ofthe armature shafts 6 byy a belt 2O Which runsy overarelativelysmall pulley 21 onthe respective rnetor shaft and a relatively large pulley 22` onthe Counter-V ,K

' jrTo adjust the peripheral' .initis Awhen 'sie on the face friction Whe'ell51-for di'erent speeds and for'inoving. thefsame from one side-'tothe kotherof the axis of said face fric' tion; Wheel vwhen the -motor 5 driving'vthe counter-shaft 18.is reversed to continueftoA drive the corrugated roll 13 inthe same direction, I provide a hand crank 23 j'ournaled vin a bearing 24 on one ofthe bearings 19`and having keyed thereto a sprocket wheel 25 Which meshes With .a rack-26 on a rod 27 of the bearings 1X9k and has a. shipper arm 29 Y 10o f i which extends parallelto the counter-shaft 18 and is'journaled in bearings 28 on certain plates 8 until the yedgesofthe ribs of said plates are Worn.' ofi' ou Vone side and then'said y motors are reversed to` reversethe grinding plates 8 sov that the other edges of their ribs .ilof

may be used until Worn out. At the time thel motor is reversed the. operator operates'thel .d

l ing action ofthe grinding plates 8.

crank E23 to move the peripheral friction Wheel to the opposite side of the axis of the face friction Wheel 15 so that` the corrugated roll 13 is operated in the same direction to properly feed stool: from the hopper 11 to the grinding plates 8. Thesmooth roll 12 is driven from the corrugated roll 13 by a pair of gears BO.

From the above description itis evident` By moving the peripheral frictionwheel 16 outof engagement with the friction Wheel 15, the rotation'of the rolls`12 and 13 may be stopped to cut off further flow of the stock tosaid rolls This is'highly important in case ofa shutdown when the hopperll is full of stock, to prevent clogging ofthe mill. Obviously, by moving tne peripheral friction vWheel V16 out ofengagement Vwith the face friction wheel 15 on either side of' its axis, therfeeding action of the rolls 1&3 and 13 will beinstantly stopped. It will be noted that the peripheral edge portion of the face friction Wheel 16 beveled so that the peripheral friction Wheel 15 will easily ride onto the saine when .setting said pey 'ripheral frictionrwheel 16 in an operative osition. Y i

VWhat I claim is: y A Y 1. The combination with a pair of co-operating niembers,and-povver means for op- Les 1,425.2

eratng the same, of a corrugated feed roll yfor the members, and friction, variable speed, driving connections for the feed roll Y from the lpower means.

2. The structure deined in claim 1 in versible motor for each member, of a feed roll for the men'ibers, and friction, variable speed,.reversible, .driving connections for the feed roll .from `one of said motors. `5 The combination With al pair of coeop erating, reversely acting members, and a reversible motor for eachl member, .of a pair of cio-operating feed rollsrfor the members, one ofv which is corrugated, and friction7 variable speed, reversible driving connections for the vcori-ugated* roll fromfone of thetinotors t3. The combination `With a pair of co-operatingzre'versely acting members, and a re versible motor foreach nien'iber, of a pair of co-operating feed rollsfor the members, one of which is corrugated, and reversible driving connections for the corriigated roll,V

from one of the motors, including a' face friction Wheel on the corrugated roll, a cooperating peripheral friction Wheel, and means for moving the/peripheral friction wheelv diametrically on 'the face friction Wheel. l

in testimony whereof i afin my signature.

vvnesrne Lonen. 

